Device for measurement of the speed of a helicopter

Details Device for measurement of the speed of a helicopter Device for measurement of the speed of a helicopter

1975-08-15

1977-05-17

Woodiel, Donald O.

Measuring and testing

Navigation

Take-off and landing monitors

244 1713, G01C 2110

Patent

active

040234096

ABSTRACT:
Apparatus for measurement of the velocity of a helicopter with reference to the air comprises two measurement systems that are substantially identical, associated with a double indicator. The measurements are effected with reference to the longitudinal axis and the transverse axis of the helicopter. Each measurement system comprises a position detector for detecting the position of the cyclic rotor pitch command member along one axis, and a detector of the acceleration component along the same axis, with a substantially identical measurement system associated with the other axis. Computing means effect integration of the algebraic sum of the measured values, and pass signals to the double indicator which indicates velocity of the helicopter along the axes. The acceleration detectors include pendular levels, and all detectors incorporate measurement potentiometers. The apparatus is especially useful in the measurement of the air speed of a helicopter close to hovering conditions.

REFERENCES:
patent: 2371626 (1945-03-01), Kecskemeti
patent: 2871699 (1959-02-01), Kenyon
patent: 3711042 (1973-01-01), Rempfer

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